Core box



Dec. 3, 1929. J. B. LUKOMSKI GORE BOX Filed Nov. 5, 1928 hit an the JOHN B. LUKOMSKI, OF DETROIT, MICHIGAN GORE BOX Application filed. November 5, 1928.

The present invention pertains to a novel core box for forming amultiple or a series of cores. The cores for small cavities are usually made of clay, plaster, or other composition which must be allowed time to set and which also in. many cases must be baked.

The object of the present invention is to enable the use of green sand in making such cores so that the operations of setting or baking are eliminated. Accordingly, the core box is made in such a way that an arbor may be used to maintain the cores in proper shape. The use of an arbor is made possible by arranging the core sections spacedly on the perimeter of an enclosed area, placing the fingers of the arbor in the spaces between the sections and forming a continuous and endless core with connecting parts which contain the fingers of the arbor.

The invention is fully disclosed by way of example in the following description and in the accompanying drawing, in which- Figure 1 is a fragmentary plan view of the core box in open condition;

Fig. 2 is a diametrical section thereof in closed condition;

Fig. 3 is a plan View of one of the core sections;

Fig. 4: is a fragmentary section taken across the ends of two adjacent core sections and showing also the mold built around the same;

Fig. 5 is a section on the line 55 of Figure a; and

Fig. 6 is a fragmentary plan view of the core made in the core box.

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts througlr out.

Inasmuch as both halves of the core box are identical, only one of them will be described in detail. finch a half of the core box is made up of a number of core box sections 1 suitably located to form an enclosed area, or on the perimeter of an enclosed area, and spaced from one another as indicated by the numeral 2. As will be seen in Figures i. and 3, these sections are hollowed out to form core parts of the reset a shape. It

Serial No. 317,197.

will also be evident that this manner of location lends itself particularly to angular members, such as elbow fittings, which can readily be arranged in the manner described. The core sections may moreover consist of actual castings or patterns properly hollowed out and permanently located on a plate, although in the embodiment illustrated the sections are located on a board from which they arercmoved after being united by the connecting members which will now be described.

Into the spaces 2 between the core box sections are inserted cores 3 having the same cross sectional configuration as the open ends of the sections 1. The object of these cores is to obstruct the open ends of the sections and leave the solid parts of the ends exposed. A mold 4.- with a sprue 5 is fitted over the ends of each pair of adjacent sections in such a manner as to convert the space 2 into a cavity uniting the solid parts of the sections. The ends of the sections are preferably equipped with screws or pins 6 anchored therein and extending into the space 2. Metal is now poured into the molds, and after it has set, the mold structures including the cores 3 are removed. In this manner there are formed shell members 7 connecting the core sections and defining recesses communicating with the cavities of the core sections, so that a continuous and endless cavity extends through the core box sections and the shell members.

The other half 8 of the core box is builtin like manner and the two halves are connected by a hinge 9 which permits one to be laid in proper alignment over the other as shown in Figure 2.

An arbor 10 is laid around the core box thus formed and is equipped with fingers 11 which extended into the connecting sections 7 of one of the core box halves. The connecting sections of this half are grooved as at 12 on the parting; face to permit the fingers to seat therein and also to properly locate the arbor. The halves of the core box are now filled with sand and closed one by the other. The core thus formed is an endless member and r5 [as its shape althounh it is of small Mill cross section and made of green sand, because of the arbor fingers 11, the use of Which is made possible by the arrangement of the core 'munrcation-with the cavities of said sections,

box sections and the connecting shell members 7 in the form of an enclosure. The finished core 13 supported. on the arbor fingers is illustrated in Figure 6.

Although a specific embodiment of the in- Vention has been illustrated and described, it Will be understood-that various alterations in the details of construction may be made without departing from the scope of the invention as indicated by the appended claims.

What I claim is 1. .A core box consisting of core box sections arranged spacedly on the perimeter of an enclosed area, shell members connecting said sections and defining recesses in communication with the cavities of said sections, whereby a continuous endless core may be formed in said sections and shell members.

2. A core box consisting of core boX sections arranged spacedly on the perimeter of an enclosed area, shell members connecting said sections and defining recesses in com- Whereby a continuous endless core may be 'iiorm'edxin said sections and shell members,

and an 'arborconcentric with said area, said arbor having fingersex'tending 1nto said shell members.

Intes'timo'ii'y whereof 'I 'afiix my signature.

JOHN -B. LUKOMSKI. 

